Ma-Ter Safety pressure switch XPZ1AP62.005

Ma-Ter XPZ1AP62.005 is a safety pressure switch for BAXI gas boilers, also known as XP-602. It monitors heating medium pressure in the heating circuit, with contacts closed at normal pressure and opening when pressure drops below approximately 0.5-0.9 bar, shutting down the boiler to prevent damage. This switch is compatible with BAXI models such as Eco Four, Eco-3, Main, and Luna-3 series. It is a key safety component that triggers errors like E10/E12 on low pressure.

Pressure switches of this type are selected by matching the switching range, differential, connection type (thread or hose spigot), and contact rating to the original part. Before ordering, verify the medium (air or gas) and the setpoint against the boiler's specifications. Installation involves connecting the impulse tube and ensuring proper electrical connections, with the switch typically mounted on a bracket or directly on the boiler.

Common failure modes include a torn diaphragm, blocked impulse tube, or drifted setpoint, leading to burner lockouts that may resemble ignition problems. When the switch fails, the boiler may shut down or fail to start, often displaying an error code. Check the pressure switch and its impulse line during troubleshooting.